From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9D4B2C43381 for ; Mon, 4 Mar 2019 14:47:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 755A420815 for ; Mon, 4 Mar 2019 14:47:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726982AbfCDOr5 (ORCPT ); Mon, 4 Mar 2019 09:47:57 -0500 Received: from mx1.redhat.com ([209.132.183.28]:54342 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726261AbfCDOr5 (ORCPT ); Mon, 4 Mar 2019 09:47:57 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 447CD8123A; Mon, 4 Mar 2019 14:47:57 +0000 (UTC) Received: from krava (unknown [10.43.17.112]) by smtp.corp.redhat.com (Postfix) with SMTP id E064051F0A; Mon, 4 Mar 2019 14:47:55 +0000 (UTC) Date: Mon, 4 Mar 2019 15:47:55 +0100 From: Jiri Olsa To: Andi Kleen Cc: acme@kernel.org, jolsa@kernel.org, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Andi Kleen Subject: Re: [PATCH v3 10/11] perf tools report: Implement browsing of individual samples Message-ID: <20190304144755.GF30476@krava> References: <20190228183550.14126-1-andi@firstfloor.org> <20190228183550.14126-11-andi@firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190228183550.14126-11-andi@firstfloor.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Mon, 04 Mar 2019 14:47:57 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Feb 28, 2019 at 10:35:49AM -0800, Andi Kleen wrote: > From: Andi Kleen > > Now report can show whole time periods with perf script, > but the user still has to find individual samples of interest > manually. > > It would be expensive and complicated to search for the > right samples in the whole perf file. Typically users > only need to look at a small number of samples for useful > analysis. > > Also the full scripts tend to show samples of all CPUs and all > threads mixed up, which can be very confusing on larger systems. > > Add a new --samples option to save a small random number of samples > per hist entry > > Use a reservoir sample technique to select a representatve > number of samples. > > Then allow browsing the samples using perf script > as part of the hist entry context menu. This automatically > adds the right filters, so only the thread or cpu of the sample > is displayed. Then we use less' search functionality > to directly jump the to the time stamp of the selected > sample. I'm getting this error for workload sampling: File does not contain CPU events. Remove -C option to proceed. jirka